Specifications
Installation and Operation Manual Chapter 1 Introduction
IPmux-8/16 Ver. 6.00 Functional Description 1-21
The switch modes are described later in this section. They are:
• Transparent
• Untagged
• Tagged
• Double tagged.
When processing traffic IPmux-8/16 switch utilizes four queues for frame
forwarding. This is why the switch combines VLAN priority into four groups 0–1,
2–3, 4–5, 6–7, preserving the initial hierarchy (frames with 0–1 priority are
forwarded before frames with 2–3 priority).
Rate Limiter Option
In this option a rate limiter is available to limit user port traffic. This feature is
valuable when a limited bandwidth is used to extend the Ethernet link (generally
when the Ethernet link rate is limited/shaped to a lower rate after IPmux). In this
case TDMoIP packets will be dropped by a lower-rate device even if it was
prioritized at the IPmux internal switch. This is prevented by limiting the user port
to actual link rate minus TDMoIP bandwidth.
Network and user traffic can be limited to the following data rates:
Table 1-3. Rate Limiter Options
Network Interface (Egress) User Interface (Ingress)
256 kbps, 512 kbps, 1 Mbps, 2 Mbps,
4 Mbps, 8 Mbps, 10 Mbps, 16 Mbps,
20 Mbps, 25 Mbps, 40 Mbps,
50 Mbps, 80 Mbps
256 kbps, 512 kbps, 1 Mbps, 2 Mbps,
4 Mbps, 8 Mbps, 16 Mbps, 32 Mbps,
64 Mbps
Switch Behavior When Handling User and Network Traffic
The way the network and user ports handle the traffic depends on the selected
port mode (transparent, untagged, tagged or double tagged) and frame type
(untagged, tagged or double tagged).
Table 1-4 lists all operation modes of the
network and user ports. The modes are explained in greater detail in
Table 1-5,
Table 1-6, Table 1-7, Table 1-8, Table 1-9, Table 1-10 and Table 1-11.
Table 1-4. Switch Behavior (User and Network Traffic)
Network
User
Transparent Untagged Tagged Double Tagged
Transparent
Mode A Mode B Mode C Not applicable
Untagged
Mode B Mode D Mode E Not applicable
Tagged
Mode C Mode E Mode F Not applicable
Double Tagged
Mode G Not implemented Not implemented Not applicable
Note